Piston



Patented Mar. 3, 1 925 JOHN F. NORTON, OF BOSTON, MASSACHUSETTS.

PISTON.

Application filed March 29,1923. Serial Ito 628,459.

. To all whom it may concern Be it known that I, J OHN' F. NORTON, a citizen of the United States, residing at Boston, in the county of Suffolk and State 5 of Massachusetts, have invented new and useful Improvements in Pistons, of which the following is a specification.

This invention relates to an improved piston particularly adapted for use in the cylinders of internal combustion engines.

The object of the invention is to provide a piston which will prevent carbonized matter formed within the combustion chamber of an engine from becoming permanently deposited upon the outer surface of the end wall ofthe piston. a

This invention is an improvement as to specific arrangements of depressions, the same being broadly claimed in an applica- 2 tion for Letters Patent by me filed February 7, 1923, Serial No. 617,474. The specific arrangement of grooves or depressions in the ,end wall of the piston embody intersecting grooves which may be either straight .or curved.

' The. invention further embodies a piston having pyramidal projections on the outer end wall.

The inventionfurther consists in a piston with depressions in its outer end wall as set forth in the several claims hereunto appended.

Referring to the drawings z.- j

Figu bodylng one form of my invention.

Fig. 2 is an end view embodying another form of my invention.

Fig. 3, is a transverse-section taken on ,line 3-3, Figure 1.

44,Figure 1.

' Fig. 5 is an end view of another embodiment of my invention.

Fig. 6 is an end view of still another em bodiment of my invention.

Like numerals refer to out the several views of the drawings.

In the drawings, referring to Figs. 1 and 3, 10 represents a piston of an internal com- 50 bustion engine, said piston being of wellknown construction, except as to the grooves in the outer end wall thereof and provided adjacent the upper closed end with a plurality of annular grooves 11 extending around re 1 is an end view of a piston emi Fig. 4 is a transverse section taken on line like parts throughthe periphery thereof, in each of which is located a piston ring 12 of the usual wellknown construction.

The closed outer. end 13'of the piston is provided with a plurality of straight depres sions. or grooves 14 which extend entirely across the outer end of the piston and are separated from each other by inverted V- shaped ridges 15. The grooves 14 and ridges 15 are provided for the purpose of eliminat ing the smooth surface heretofore always found on the outer end of a piston and as the piston expands and contracts wit-lithe alternate heating and cooling which it undergoes, there is a tendency caused by the presence'of the grooved outer end surface to real; up any incrustation of carbonized matter which may be formed thereon While the engine is running. and thereby prevent said carbonized matter from collecting upon said outer surface and becoming permanently attached thereto.-

In Figs. 2 and 4 the outer end surface of the piston 16' is provided with pyramidal projections 17 formed by a plurality ofintersecting V-shaped grooves 18 and 19.

In Fig. 5 a plurality of concentric grooves 20 are provided in the outer end wall of a piston 21, which are separated from each other by inverted V-shaped curved ridges 22. The grooves and ridges are of the same shape in cross section, as the grooves and ridges in Fig. 3.

In Fig. 6 a piston 23 is provided with a plurality of concentric grooves 24 which intersect a plurality of concentric grooves 25, thus forming diamond-shaped pyramidal projections 26.

I claim 1. A piston for high-speed internal combustion gasoline engines embodyin therein a closedend wall provided with intersecting grooves upon the outer end surface thereof.

2. A piston for high-speed internal coni- I bust-ion gasoline engines embodying therein a closed end wall provided with intersecting depressions upon the outer end surface thereof.

8. A piston-for high-speed internal combustion gasoline engines embodying therein a closed end wall provided withintersecting straight grooves upon the-outer end surface thereof.-

4. A piston for high-speed internei eomprojections upon the outer end surface 10 bustion gasoline engines embodying therein thereof. a closed end Wall provided with straight In testimony whereof I have hereunto set grooves upon the outer end surface thereof my hand in presence of two subscribing witthe Width of said grooves being greater then nesses.

their depth. JOHN F. NQRTON.

5. A piston for high-speed internal oom- Witnesses: bustion gasoline engines embodying therein CHARLES S. Gooome,

a, closed end wall provided With pyramidal FRANKLIN F. Lowi 

